Adds the option of aligning the launcher to the left or right. There

ash/launcher/launcher_alignment_menu.cc

Index: ash/launcher/launcher_alignment_menu.cc
diff --git a/ash/launcher/launcher_alignment_menu.cc b/ash/launcher/launcher_alignment_menu.cc
new file mode 100644
index 0000000000000000000000000000000000000000..39226b520e258e3849d65a0df90fdbd0c2916c62
--- /dev/null
+++ b/ash/launcher/launcher_alignment_menu.cc
@@ -0,0 +1,71 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/launcher/launcher_alignment_menu.h"
+
+#include "ash/shell.h"
+#include "ash/wm/shelf_auto_hide_behavior.h"
+#include "grit/ash_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+
+namespace ash {
+
+LauncherAlignmentMenu::LauncherAlignmentMenu() : ui::SimpleMenuModel(NULL) {
+  int align_group_id = 1;
+  set_delegate(this);
+  AddRadioItemWithStringId(MENU_ALIGN_LEFT,
+                           IDS_AURA_LAUNCHER_CONTEXT_MENU_ALIGN_LEFT,
+                           align_group_id);
+  AddRadioItemWithStringId(MENU_ALIGN_BOTTOM,
+                           IDS_AURA_LAUNCHER_CONTEXT_MENU_ALIGN_BOTTOM,
+                           align_group_id);
+  AddRadioItemWithStringId(MENU_ALIGN_RIGHT,
+                           IDS_AURA_LAUNCHER_CONTEXT_MENU_ALIGN_RIGHT,
+                           align_group_id);
+}
+
+LauncherAlignmentMenu::~LauncherAlignmentMenu() {
+}
+
+bool LauncherAlignmentMenu::IsCommandIdChecked(int command_id) const {
+  switch (command_id) {
+    case MENU_ALIGN_LEFT:
+      return ash::Shell::GetInstance()->GetShelfAlignment() ==
+          SHELF_ALIGNMENT_LEFT;
+    case MENU_ALIGN_BOTTOM:
+      return ash::Shell::GetInstance()->GetShelfAlignment() ==
+          SHELF_ALIGNMENT_BOTTOM;
+    case MENU_ALIGN_RIGHT:
+      return ash::Shell::GetInstance()->GetShelfAlignment() ==
+          SHELF_ALIGNMENT_RIGHT;
+    default:
+      return false;
+  }
+}
+
+bool LauncherAlignmentMenu::IsCommandIdEnabled(int command_id) const {
+  return true;
+}
+
+bool LauncherAlignmentMenu::GetAcceleratorForCommandId(
+      int command_id,
+      ui::Accelerator* accelerator) {
+  return false;
+}
+
+void LauncherAlignmentMenu::ExecuteCommand(int command_id) {
+  switch (static_cast<MenuItem>(command_id)) {
+    case MENU_ALIGN_LEFT:
+      ash::Shell::GetInstance()->SetShelfAlignment(SHELF_ALIGNMENT_LEFT);
+      break;
+    case MENU_ALIGN_BOTTOM:
+      ash::Shell::GetInstance()->SetShelfAlignment(SHELF_ALIGNMENT_BOTTOM);
+      break;
+    case MENU_ALIGN_RIGHT:
+      ash::Shell::GetInstance()->SetShelfAlignment(SHELF_ALIGNMENT_RIGHT);
+      break;
+  }
+}
+
+}  // namespace ash